Same here: met the crew at Essen in November and the release was "imminent" back then :-(
From experience, the SS pipes should be notably louder and more metallic than Millteks.
Do not listen to the R32's Milltek pipes, as they do not convey how the A3 3.2's Milltek pipes sound.
I've been running the resonated cat-back for nearly a year now, and it is anything but "ricey". It's a mellow, near-stock tone, with a little extra volume. If you want, IM me and I'll give you my phone number. I'll have you listen to it that way, should you want to...
Ben.